import java.util.Scanner;
import java.math.*;
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        while (in.hasNext()) { 
            BigDecimal a = in.nextBigDecimal();
            BigDecimal b = in.nextBigDecimal();
            BigDecimal c = in.nextBigDecimal();
            if(a.add(b).compareTo(c) > 0
            && a.add(c).compareTo(b) > 0
            && b.add(c).compareTo(a) > 0
            ){
                System.out.println("Yes");
            }else{
                System.out.println("No");
            }
        }
    }
}